... and stone renew and crystallization.diamond floor grinding machine HWG 78 has planet disc plates, counter rotate, grind and polish surface ... it perfect for large area grinding and polishing.Performance:1,Up and down planet disc plates, anti-counter rotation;2 ... , marble, granite, terrazzo with various grit of diamond metal, resin bond;2,Remove painting, coating, epoxy, urethane, glue, polyurethane ...